personally, i would not attempt to layout anything this scrappy with the matching blocks right together...move them around, take pix... the pictures take you further away and you can judge better... they would be great as stated by dunster...or putting in a unifying sash that would let them all relate to the same thing ... can's state for sure because of computer color differences, but a med dark gray would make them ALL get lighter and brighter by comparison... you would benefit by just a little more contrast.... but as i said, that may be my computer flattening them a bit...the deep coral is the brightest color on my screen... if you have something in gray...lay them on it but put a few inches apart to simulate the sashing... maybe they all just need a frame... it is really interesting and i'm sure you will trust your eye when you see the one that's right...